Mdthbs

Below is my MWE. My only problem is, I need the tikzpicture to be pagewidth (textwidth) and not overflow to the right. I tried adjustbox, fbox and resizebox.

documentclass[

a4paper,            %   Papierformat A4

12pt,               %   Schrift 12-Punkt

headsepline,        %   mit Linie unter der Kopfzeile

numbers=noenddot,   %   Nummern ohne Punkt am Ende

bibliography=totoc, %   Literaturverzeichnis mit Nummer im             

Inhaltsverzeichnis (``TO Table Of Contents'')

index=totoc,        %   Index mit Nummer im Inhaltsverzeichnis

fleqn,              %   Formeln werden linksbündig statt zentriert 

angeordnet

headings=normal     %       Etwas kleinere Überschriften

]{scrbook}



usepackage{tikz}

usetikzlibrary{matrix, positioning,chains}

usetikzlibrary{calc,trees,positioning,arrows,chains,shapes.geometric,%

decorations.pathreplacing,decorations.pathmorphing,shapes,%

matrix,shapes.symbols}



usepackage{capt-of}





tikzstyle{rounddiagram} = [

%tikzset{

>=stealth',

punktchain/.style={

rectangle, 

rounded corners, 

% fill=black!10,

draw=black, very thick,

text width=10em, 

minimum height=3em, 

text centered, 

on chain},

line/.style={draw, thick, <-},

element/.style={

tape,

top color=white,

bottom color=blue!50!black!60!,

minimum width=8em,

draw=blue!40!black!90, very thick,

text width=10em, 

minimum height=3.5em, 

text centered, 

on chain},

every join/.style={->, thick,shorten >=1pt},

decoration={brace},

tuborg/.style={decorate},

tubnode/.style={midway, right=2pt},

]%}





begin{document}

begin{figure}



    begin{tikzpicture}

    [style=rounddiagram, node distance=.8cm, start chain=going right]

    node[punktchain, join]{FairRun};

    node[punktchain, join]{Set I/O};

    node[punktchain, join]{CbmStsFindClusters};

    node[punktchain, join]{CbmStsFindHits};

    end{tikzpicture}

    end{figure}

end{document}

Any help is appreciated.

You can always compute the maximal width the nodes should have to fill the full page precisely. We need 4*(space taken by a node)+3*(node distance)=textwidth, where space taken by a node=(text width) + 2*(inner sep)+2*(outer sep). Note that tikzstyle is deprecated.

documentclass[

a4paper,            %   Papierformat A4

12pt,               %   Schrift 12-Punkt

headsepline,        %   mit Linie unter der Kopfzeile

numbers=noenddot,   %   Nummern ohne Punkt am Ende

bibliography=totoc, %   Literaturverzeichnis mit Nummer im             

Inhaltsverzeichnis (``TO Table Of Contents'')

index=totoc,        %   Index mit Nummer im Inhaltsverzeichnis

fleqn,              %   Formeln werden linksbündig statt zentriert 

angeordnet

headings=normal     %       Etwas kleinere Überschriften

]{scrbook}



usepackage{tikz}

usetikzlibrary{matrix, positioning,chains}

usetikzlibrary{calc,trees,positioning,arrows,chains,shapes.geometric,%

decorations.pathreplacing,decorations.pathmorphing,shapes,%

matrix,shapes.symbols}



usepackage{capt-of}





tikzset{rounddiagram/.style={>=stealth'},

punktchain/.style={

rectangle, 

rounded corners, 

% fill=black!10,

draw=black, very thick,

text width=10em, 

minimum height=3em, 

text centered, 

on chain},

% line/.style={draw, thick, <-},

% element/.style={

% tape,

% top color=white,

% bottom color=blue!50!black!60!,

% minimum width=8em,

% draw=blue!40!black!90, very thick,

% text width=10em, 

% minimum height=3.5em, 

% text centered, 

% on chain},

every join/.style={->, thick,shorten >=1pt},

% decoration={brace},

% tuborg/.style={decorate},

% tubnode/.style={midway, right=2pt},

}





begin{document}

begin{figure}



begin{tikzpicture}[rounddiagram, node distance=.8cm, start chain=going right]

    pgfmathsetmacro{mynodewidth}{(textwidth-3*0.8cm)/4-4pt}

    begin{scope}[punktchain/.append style={text width=mynodewidth pt,inner sep=1pt,outer

    sep=1pt}]

    node[punktchain, join]{FairRun};

    node[punktchain, join]{Set I/O};

    node[punktchain, join]{CbmStsFindClusters};

    node[punktchain, join]{CbmStsFindHits};

    end{scope}

end{tikzpicture}

end{figure}

end{document}

The output suggests that you may either want to write the text of the third node in two lines, have different widths for different nodes or to make them smaller by using scale=(something <1) in the nodes.

There are two approaches:

As @Zarko mentioned, you can change the font and reduce the size of the text width. The second approach is to leave everything the same and add transform canvas={xshift = 0.8cm} to tikzpicture options.

documentclass[

a4paper,            %   Papierformat A4

12pt,               %   Schrift 12-Punkt

headsepline,        %   mit Linie unter der Kopfzeile

numbers=noenddot,   %   Nummern ohne Punkt am Ende

bibliography=totoc, %   Literaturverzeichnis mit Nummer im             

Inhaltsverzeichnis (``TO Table Of Contents'')

index=totoc,        %   Index mit Nummer im Inhaltsverzeichnis

fleqn,              %   Formeln werden linksbündig statt zentriert 

angeordnet

headings=normal     %       Etwas kleinere Überschriften

]{scrbook}



usepackage{tikz}

usetikzlibrary{matrix, positioning,chains}

usetikzlibrary{calc,trees,positioning,arrows,chains,shapes.geometric,%

decorations.pathreplacing,decorations.pathmorphing,shapes,%

matrix,shapes.symbols}



usepackage{capt-of}





tikzstyle{rounddiagram} = [

%tikzset{

>=stealth',

punktchain/.style={

rectangle, 

rounded corners, 

% fill=black!10,

draw=black, very thick,

text width=7.5em, 

minimum height=3em, 

text centered, 

font = footnotesize,

on chain},

line/.style={draw, thick, <-},

element/.style={

tape,

top color=white,

bottom color=blue!50!black!60!,

minimum width=8em,

draw=blue!40!black!90, very thick,

text width=10em, 

minimum height=3.5em, 

text centered, 

on chain},

every join/.style={->, thick,shorten >=1pt},

decoration={brace},

tuborg/.style={decorate},

tubnode/.style={midway, right=2pt},

]%}





begin{document}

    begin{figure}

    begin{tikzpicture}

    [style=rounddiagram, node distance=.8cm, start chain=going right]

    node[punktchain, join]{FairRun};

    node[punktchain, join]{Set I/O};

    node[punktchain, join]{CbmStsFindClusters};

    node[punktchain, join]{CbmStsFindHits};

    end{tikzpicture}

    end{figure}



    begin{figure}

    begin{tikzpicture}

    [style=rounddiagram, node distance=.8cm, start chain=going right, transform canvas={xshift = 0.8cm}]

    node[punktchain, join, text width=10em, font =normalsize]{FairRun};

    node[punktchain, join, text width=10em, font =normalsize]{Set I/O};

    node[punktchain, join, text width=10em, font =normalsize]{CbmStsFindClusters};

    node[punktchain, join, text width=10em, font =normalsize]{CbmStsFindHits};

    end{tikzpicture}

    end{figure}

end{document}

i would change text width with minimum width which i would reduce to smaller size, for example to 7em. also I would all doubled TikZ libraries and use tikzset instead of tikzstyle:

(red lines indicate text borders)

documentclass[

a4paper,            %   Papierformat A4

12pt,               %   Schrift 12-Punkt

headsepline,        %   mit Linie unter der Kopfzeile

numbers=noenddot,   %   Nummern ohne Punkt am Ende

bibliography=totoc, %   Literaturverzeichnis mit Nummer im

Inhaltsverzeichnis (``TO Table Of Contents'')

index=totoc,        %   Index mit Nummer im Inhaltsverzeichnis

fleqn,              %   Formeln werden linksbündig statt zentriert

angeordnet

headings=normal     %       Etwas kleinere Überschriften

]{scrbook}



usepackage{tikz}

usetikzlibrary{arrows,

                calc, chains,

                decorations.pathreplacing, decorations.pathmorphing,

                matrix,

                positioning,

                shapes.geometric, shapes.symbols,

                trees

                }



usepackage{capt-of}





tikzset{rounddiagram/.style = {

>=stealth',

punktchain/.style = {rectangle, rounded corners, draw, very thick,

                     minimum width=7em, % <--- changed from "text width"

                     minimum height=5ex,

                     align=center, on chain},

      line/.style = {draw, thick, <-},

   element/.style = {tape, draw=blue!40!black!90, very thick,

                     top color=white, bottom color=blue!50!black!60!,

                     text width=10em, minimum height=7ex,

                     align=center, on chain},

every join/.style = {->, thick,shorten >=1pt},

       decoration = {brace},

    tuborg/.style = {decorate},

   tubnode/.style = {midway, right=2pt},

}}



%---------------- show page layout. don't use in a real document!

usepackage{showframe}

renewcommandShowFrameLinethickness{0.15pt}

renewcommand*ShowFrameColor{color{red}}

%---------------------------------------------------------------%





begin{document}

begin{figure}

    centering

    begin{tikzpicture}[style=rounddiagram,

node distance=5mm,

start chain=going right,

punktchain/.append style = {join}

                        ]

node[punktchain] {FairRun};

node[punktchain] {Set I/O};

node[punktchain] {CbmStsFindClusters};

node[punktchain] {CbmStsFindHits};

end{tikzpicture}

    end{figure}

end{document}